That has turned attention to the downstream market and opportunities to create new markets from Ivory Coast to remote Indonesian islands by building gas-fired power plants, pipelines, regasification and storage terminals.

"We are ready to go downstream as much as it takes to unlock gas demand," said Laurent Vivier, president for the gas division at Total.

"We need to be present in downstream ourselves, to create demand and unlock bottlenecks along the chain including regasification, pipelines and power plants."

Total aims to triple the number of its gas and power markets and raise its annual LNG output to 20 million tonnes and its trading to 15 million tonnes by 2020.

The company is taking part in LNG infrastructure tenders, including several gas-fired power plants, in countries including Indonesia, Chile, Ivory Coast, Ghana and Morocco, Vivier said.

Shell believes the number of markets buying LNG could double, according to its chief financial officer, Simon Henry.

"From around 20 to 30 ...we can see potential for around 50 different markets if you look out to 2030," Henry said. "Our aim is to capture the best share of those who are looking now to start or grow." The focus on downstream mimics a model that companies such as Shell, Total, Exxon Mobil and Chevron have used for decades in the oil sector where their operations span oil wells, refineries and service stations.

But some analysts question how easily that model can be reproduced.

"Whether they succeed in this is another story, whether they have the mindset for this type of work is also another story," said Thierry Bros, senior gas analyst at French bank Societe Generale.

"It will be a painful test for these companies who are not that experienced in building small downstream demand," he said.

TECHNOLOGY

New technologies are helping speed development, with floating terminals, for example, offering a cheaper alternative to onshore units that cost more than $1 billion.

"We are looking at multiple markets around the world in terms of potential to regas," said Shell's Henry. "Quite a lot of it is floating regasification because it is quick and you can develop (a market) in stages."

Shell, the world's top LNG trader after buying BG Group, expects to produce around 30 million tonnes of LNG this year and trade nearly 50 million tonnes, accounting for about a sixth of global trading volume.

Global output capacity is expected to rise by half by 2020, potentially adding some 150 million tonnes of LNG to the market.

However, overall gas demand growth is expected to slow to 1.5 percent a year to 2021 from the 2.5 percent rate seen recently, the International Energy Agency has forecast.

In step with oil and gas, LNG prices have also struggled in the last two years. That has prompted traders to offer more single cargoes for immediate delivery on the spot market, making it easier for smaller buyers to find supply.